RAG vs Agentic RAG: A Comprehensive Guide

Also read: Evolution of RAG, Long Context LLMs to Agentic RAG

To understand RAG vs Agentic RAG, let’s understand their implementation.

Hands-On: Build a Simple RAG System

Necessary Libraries and Imports

!pip install langchain==0.3.4
!pip install langchain-openai==0.2.3
!pip install langchain-community==0.3.3
!pip install jq==1.8.0
!pip install pymupdf==1.24.12
!pip install langchain-chroma==0.1.4
from getpass import getpass
OPENAI_KEY = getpass('Enter Open ai API Key: ')
import os
os.environ('OPENAI_API_KEY') = OPENAI_KEY
from langchain_openai import OpenAIEmbeddings
openai_embed_model = OpenAIEmbeddings(model="text-embedding-3-small")

1. Core Functionalities

JSON Document Handling

Processes JSON documents into structured formats:

from langchain.document_loaders import JSONLoader
import json
from langchain.docstore.document import Document
# Load JSON documents
loader = JSONLoader(file_path="./rag_docs/wikidata_rag_demo.jsonl",
                    jq_schema=".",
                    text_content=False,
                    json_lines=True)
wiki_docs = loader.load()
# Process JSON documents
import json
from langchain.docstore.document import Document
wiki_docs_processed = ()
for doc in wiki_docs:
    doc = json.loads(doc.page_content)
    metadata = {
        "title": doc('title'),
        "id": doc('id'),
        "source": "Wikipedia"
    }
    data=" ".join(doc('paragraphs'))
    wiki_docs_processed.append(Document(page_content=data, metadata=metadata))

Output

Document(metadata={'title': 'Chi-square distribution', 'id': '71548',
'source': 'Wikipedia'}, page_content="In probability theory and statistics,
the chi-square distribution (also chi-squared or formula_1\xa0 distribution)
is one of the most widely used theoretical probability distributions. Chi-
square distribution with formula_2 degrees of freedom is written as
formula_3. It is a special case of gamma distribution. Chi-square
distribution is primarily used in statistical significance tests and
confidence intervals. It is useful, because it is relatively easy to show
that certain probability distributions come close to it, under certain
conditions. One of these conditions is that the null hypothesis must be
true. Another one is that the different random variables (or observations)
must be independent of each other.")

PDF Document Handling

Splits PDF content into chunks for vector embedding:

from langchain.document_loaders import PyMuPDFLoader
from langchain.text_splitter import RecursiveCharacterTextSplitter
def create_simple_chunks(file_path, chunk_size=3500, chunk_overlap=200):
    loader = PyMuPDFLoader(file_path)
    doc_pages = loader.load()
    splitter = RecursiveCharacterTextSplitter(chunk_size=chunk_size, chunk_overlap=chunk_overlap)
    return splitter.split_documents(doc_pages)
from glob import glob
pdf_files = glob('./rag_docs/*.pdf')
# Process PDF files
paper_docs = ()
for fp in pdf_files:
    paper_docs.extend(create_simple_chunks(file_path=fp))

Output

Loading pages: ./rag_docs/cnn_paper.pdf
Chunking pages: ./rag_docs/cnn_paper.pdf
Finished processing: ./rag_docs/cnn_paper.pdf
Loading pages: ./rag_docs/attention_paper.pdf
Chunking pages: ./rag_docs/attention_paper.pdf
Finished processing: ./rag_docs/attention_paper.pdf
Loading pages: ./rag_docs/vision_transformer.pdf
Chunking pages: ./rag_docs/vision_transformer.pdf
Finished processing: ./rag_docs/vision_transformer.pdf
Loading pages: ./rag_docs/resnet_paper.pdf
Chunking pages: ./rag_docs/resnet_paper.pdf
Finished processing: ./rag_docs/resnet_paper.pdf

2. Embedding and Vector Storage

Creates embeddings for documents using OpenAI’s model and stores them in a Chroma vector database:

from langchain_openai import OpenAIEmbeddings
from langchain_chroma import Chroma
# Initialize embedding model
openai_embed_model = OpenAIEmbeddings(model="text-embedding-3-small")
# Combine documents
total_docs = wiki_docs_processed + paper_docs
# Create and save vector database
chroma_db = Chroma.from_documents(documents=total_docs,
                                  collection_name="my_db",
                                  embedding=openai_embed_model,
                                  collection_metadata={"hnsw:space": "cosine"},
                                  persist_directory="./my_db")

Load an existing vector database from disk:

chroma_db = Chroma(persist_directory="./my_db",
                   collection_name="my_db",
                   embedding_function=openai_embed_model)

3. Semantic Retrieval

Retrieves the top-k most relevant documents based on a query:

similarity_retriever = chroma_db.as_retriever(search_type="similarity", search_kwargs={"k": 5})
# Query for semantic similarity
query = "What is machine learning?"
top_docs = similarity_retriever.invoke(query)
# Display results
from IPython.display import display, Markdown
def display_docs(docs):
    for doc in docs:
        print('Metadata:', doc.metadata)
        print('Content Brief:')
        display(Markdown(doc.page_content(:1000)))
        print()
display_docs(top_docs)

4. RAG Pipeline

Combines retrieval with a generative ai model for Q&A:

Prompt Template

from langchain_core.prompts import ChatPromptTemplate
rag_prompt = """You are an assistant who is an expert in question-answering tasks.
                Answer the following question using only the following pieces of retrieved context.
                If the answer is not in the context, do not make up answers, just say that you don't know.
                Keep the answer detailed and well formatted based on the information from the context.
                Question:
                {question}
                Context:
                {context}
                Answer:
            """
rag_prompt_template = ChatPromptTemplate.from_template(rag_prompt)

Pipeline Construction

from langchain_core.runnables import RunnablePassthrough
from langchain_openai import ChatOpenAI
# Initialize ChatGPT model
chatgpt = ChatOpenAI(model_name="gpt-4o-mini", temperature=0)
# Format documents into a single string
def format_docs(docs):
    return "\n\n".join(doc.page_content for doc in docs)
# Construct the RAG pipeline
qa_rag_chain = (
    {
        "context": (similarity_retriever | format_docs),
        "question": RunnablePassthrough()
    }
      |
    rag_prompt_template
      |
    chatgpt
)

Example Usage

query = "What is the difference between ai, ML, and DL?"
result = qa_rag_chain.invoke(query)
# Display the generated answer
from IPython.display import display, Markdown
display(Markdown(result.content))

query = "What is LangGraph?"
result = qa_rag_chain.invoke(query)
display(Markdown(result.content))

Output

I don't know.

This is due to the fact that the document does not contain any information about the LangGraph.

Also read: A Comprehensive Guide to Building Multimodal RAG Systems

LangChain Agentic RAG System Using the IBM Granite-3.0-8B-Instruct model

Here, we will create an Agentic RAG system that uses external information to discuss the 2024 US Open.

1. Setting Up the Environment

This involves creating the necessary infrastructure:

• Log in to watsonx.ai: Use your IBM Cloud credentials.
• Create a watsonx.ai Project: Obtain the project ID for the configuration.
• Set Up Jupyter Notebook: This can be done in the cloud environment or locally by uploading pre-built notebooks.

2. Configuring Watson Machine Learning (WML)

To link machine learning capabilities:

• Create WML Instance: Select the region and Lite plan for a free option.
• Generate API Key: Required for secure integration.
• Link WML to watsonx.ai Project: Integrate the project for seamless use.

3. Installing Libraries and Setting Credentials

Install required libraries:

!pip install langchain | tail -n 1
!pip install langchain-ibm | tail -n 1
!pip install langchain-community | tail -n 1
!pip install ibm-watsonx-ai | tail -n 1
!pip install ibm_watson_machine_learning | tail -n 1
!pip install chromadb | tail -n 1
!pip install tiktoken | tail -n 1
!pip install python-dotenv | tail -n 1
!pip install bs4 | tail -n 1

import os
from dotenv import load_dotenv
from langchain_ibm import WatsonxEmbeddings, WatsonxLLM
from langchain.vectorstores import Chroma
from langchain_community.document_loaders import WebBaseLoader
from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
from langchain.prompts import PromptTemplate
from langchain.tools import tool
from langchain.tools.render import render_text_description_and_args
from langchain.agents.output_parsers import JSONAgentOutputParser
from langchain.agents.format_scratchpad import format_log_to_str
from langchain.agents import AgentExecutor
from langchain.memory import ConversationBufferMemory
from langchain_core.runnables import RunnablePassthrough
from ibm_watson_machine_learning.metanames import GenTextParamsMetaNames as GenParams
from ibm_watsonx_ai.foundation_models.utils.enums import EmbeddingTypes

• Import essential libraries (LangChain for agent framework, ibm-watsonx-ai, etc.).
• Use .env to secure sensitive credentials like APIKEY and PROJECT_ID.

4. Initializing a Basic Agent

The Setup:

• Model Parameters: Use IBM’s Granite-3.0-8B-Instruct LLM with defined decoding methods, temperature, token limits, and stop sequences.
• Prompt Template: A reusable format to guide agent responses.

llm = WatsonxLLM(
    model_id= "ibm/granite-3-8b-instruct", 
    url=credentials.get("url"),
    apikey=credentials.get("apikey"),
    project_id=project_id,
    params={
        GenParams.DECODING_METHOD: "greedy",
        GenParams.TEMPERATURE: 0,
        GenParams.MIN_NEW_TOKENS: 5,
        GenParams.MAX_NEW_TOKENS: 250,
        GenParams.STOP_SEQUENCES: ("Human:", "Observation"),
    },
)
template = "Answer the {query} accurately. If you do not know the answer, simply say you do not know."
prompt = PromptTemplate.from_template(template)
agent = prompt | llm
agent.invoke({"query": "What sport is played at the US Open?"})

'\n\nThe sport played at the US Open is tennis.'

agent.invoke({"query": "Where was the 2024 US Open Tennis Championship?"})

Do not make up an answer.\n\nThe 2024 US Open Tennis Championship has not
been officially announced yet, so the location is not confirmed. Therefore,
I do not know the answer to this question.'

5. Building a Knowledge Base

This step enables the agent to retrieve specific contextual information.

1. Data Collection: Use URLs to fetch content via LangChain’s WebBaseLoader.
2. Chunking: Split data into manageable pieces using RecursiveCharacterTextSplitter.
3. Embedding: Convert documents into vector representations using IBM’s Slate model.
4. Vector Store: Store embeddings in Chroma DB.

urls = (
    "https://www.ibm.com/case-studies/us-open",
    "https://www.ibm.com/sports/usopen",
    "https://newsroom.ibm.com/US-Open-ai-Tennis-Fan-Engagement",
    "https://newsroom.ibm.com/2024-08-15-ibm-and-the-usta-serve-up-new-and-enhanced-generative-ai-features-for-2024-us-open-digital-platforms",
)
docs = (WebBaseLoader(url).load() for url in urls)
docs_list = (item for sublist in docs for item in sublist)
docs_list(0)

text_splitter = RecursiveCharacterTextSplitter.from_tiktoken_encoder(

    chunk_size=250, chunk_overlap=0

)

doc_splits = text_splitter.split_documents(docs_list)

#The embedding model that we are using is an IBM Slate™ model through the watsonx.ai embeddings service. Let's initialize it.

embeddings = WatsonxEmbeddings(
    model_id=EmbeddingTypes.IBM_SLATE_30M_ENG.value,
    url=credentials("url"),
    apikey=credentials("apikey"),
    project_id=project_id,
)

#In order to store our embedded documents, we will use Chroma DB, an open source vector store.

vectorstore = Chroma.from_documents(
    documents=doc_splits,
    collection_name="agentic-rag-chroma",
    embedding=embeddings,
)

Set up a retriever to enable queries over this knowledge base. We must set up a retriever to access information in the vector store.

retriever = vectorstore.as_retriever()

6. Defining Tools

• Create tools, like get_IBM_US_Open_context, for specialized queries.
• Tools guide the agent to retrieve specific information from the vector store.

@tool
def get_IBM_US_Open_context(question: str):
    """Get context about IBM's involvement in the 2024 US Open Tennis Championship."""
    context = retriever.invoke(question)
    return context
tools = (get_IBM_US_Open_context)

7. Advanced Prompt Template

• System Prompt: Guides the agent on formatting, tool usage, and decision-making logic.
• Human Prompt: Handles user inputs and intermediary steps.
• Combine these into a structured ChatPromptTemplate.

system_prompt = """Respond to the human as helpfully and accurately as possible. You have access to the following tools: {tools}
Use a json blob to specify a tool by providing an action key (tool name) and an action_input key (tool input).
Valid "action" values: "Final Answer" or {tool_names}
Provide only ONE action per $JSON_BLOB, as shown:"
```
{{
  "action": $TOOL_NAME,
  "action_input": $INPUT
}}
```
Follow this format:
Question: input question to answer
Thought: consider previous and subsequent steps
Action:
```
$JSON_BLOB
```
Observation: action result
... (repeat Thought/Action/Observation N times)
Thought: I know what to respond
Action:
```
{{
  "action": "Final Answer",
  "action_input": "Final response to human"
}}
Begin! Reminder to ALWAYS respond with a valid json blob of a single action.
Respond directly if appropriate. Format is Action:```$JSON_BLOB```then Observation"""
human_prompt = """{input}
{agent_scratchpad}
(reminder to always respond in a JSON blob)"""
prompt = ChatPromptTemplate.from_messages(
    (
        ("system", system_prompt),
        MessagesPlaceholder("chat_history", optional=True),
        ("human", human_prompt),
    )
)

8. Adding Memory and Chains

• Memory: Store historical interactions to refine responses using ConversationBufferMemory.
• Agent Chain: Combine the prompt, LLM, tools, and memory into an AgentExecutor.

9. Testing and Using the RAG System

• Verify behavior for complex queries requiring tools (e.g., retrieving IBM’s US Open involvement).
• Ensure fallback to basic knowledge for straightforward questions (e.g., “What is the capital of France?”).

agent_executor.invoke({"input": "Where was the 2024 US Open Tennis Championship?"})

{'input': 'Where was the 2024 US Open Tennis Championship?',
 'history': '',
 'output': 'The 2024 US Open Tennis Championship was held at the USTA Billie
Jean King National Tennis Center in Flushing, Queens, New York.'}
Great! The agent used its available RAG tool to return the location of the
2024 US Open, per the user's query. We even get to see the exact document
that the agent is retrieving its information from. Now, let's try a slightly
more complex question query. This time, the query will be about IBM's
involvement in the 2024 US Open.

agent_executor.invoke(

    {"input": "How did IBM use watsonx at the 2024 US Open Tennis Championship?"}

)

> Finished chain.

Out( ):
{'input': 'How did IBM use watsonx at the 2024 US Open Tennis Championship?',
 'history': 'Human: Where was the 2024 US Open Tennis Championship?\nAI: The
2024 US Open Tennis Championship was held at the USTA Billie Jean King
National Tennis Center in Flushing, Queens, New York.',
 'output': 'IBM used watsonx at the 2024 US Open Tennis Championship to
create generative ai-powered features such as Match Reports, ai Commentary,
and SlamTracker. These features enhance the digital experience for fans and
scale the productivity of the USTA editorial team.'}

How Does It Work in Practice?

1. Query Processing: The agent parses the user’s query.
2. Decision Making: Determines whether to use tools or respond directly.
3. Tool Interaction: If necessary, invoke the tool (e.g., get_IBM_US_Open_context).
4. Final Response: Combines retrieved data or knowledge base information to provide an accurate answer.

This structured system combines IBM’s watsonx.ai, LangChain, and machine learning to build a versatile, knowledge-augmented ai agent tailored for both general and domain-specific queries.

Also, if you are looking for an ai Agents course online, then explore: Agentic ai Pioneer Program

Conclusion

RAG (Retrieval-Augmented Generation) enhances LLMs by combining external data retrieval with generative capabilities, improving accuracy and relevance and reducing hallucinations. However, it struggles with complex, multi-step queries. Agentic RAG advances this by integrating intelligent agents that dynamically select tools, refine queries, and handle specialized tasks like code generation or visualizations. It supports multi-agent collaboration, ensuring adaptability, scalability, and precise context-aware responses. While traditional RAG suits basic Q&A and research, Agentic RAG excels in dynamic, data-intensive applications like real-time analysis and enterprise systems. Agentic RAG’s modularity and intelligence make it ideal for tackling complex tasks beyond the scope of traditional RAG systems.

I hope you find this guide helpful in understanding RAG vs Agentic RAG! If you any questions regarding the article comment below.

Frequently Asked Questions

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